- Remove Q_strrchr(), replace with standard, portable strrchr()

- Add strrchr() to bg_lib.c, patch by DevHC

code/qcommon/q_shared.h

@@ -734,7 +734,6 @@ int		Q_strncmp (const char *s1, const char *s2, int n);
 int		Q_stricmpn (const char *s1, const char *s2, int n);
 char	*Q_strlwr( char *s1 );
 char	*Q_strupr( char *s1 );
-char	*Q_strrchr( const char* string, int c );
 const char	*Q_stristr( const char *s, const char *find);
 
 // buffer size safe library replacements